<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>js操控样式-延时执行</title>

  <link rel="stylesheet" href="./css/h3.css">

</head>

<body>

  <div id="divBg" class="bg bg1">
    动态背景更换

    <hr>

    <span id="spTime">显示当前时间</span>

  </div>




  <script src="./js/h3.js"></script>

</body>

</html>